Function check_roundtrip

convert.c:347–383

}

static int check_roundtrip(const char *enc_name)
{
	/*
	 * check_roundtrip_encoding contains a string of comma and/or
	 * space separated encodings (eg. "UTF-16, ASCII, CP1125").
	 * Search for the given encoding in that string.
	 */
	const char *encoding = check_roundtrip_encoding ?
		check_roundtrip_encoding : "SHIFT-JIS";
	const char *found = strcasestr(encoding, enc_name);
	const char *next;
	int len;
	if (!found)
		return 0;
	next = found + strlen(enc_name);
	len = strlen(encoding);
	return (found && (
			/*
			 * Check that the found encoding is at the beginning of
			 * encoding or that it is prefixed with a space or
			 * comma.
			 */
			found == encoding || (
				(isspace(found[-1]) || found[-1] == ',')
			)
		) && (
			/*
			 * Check that the found encoding is at the end of
			 * encoding or that it is suffixed with a space
			 * or comma.
			 */
			next == encoding + len || (
				next < encoding + len &&
				(isspace(next[0]) || next[0] == ',')
			)
		));
}

static const char *default_encoding = "UTF-8";